| The vanadium hydrogen-storage alloy AB 35 and Laves AB2 type in hydrogen storage alloys with large quantity (2-4wt%). Vanadium crystallology hydrogen storage alloy, although the theory has high capacity, but as the electrode electrochemical catalytic activity of the poor, the discharge capacity, stable, put too much hydride hydrogen dynamic performance of a poorer, restrict the batteries in Ni/H. (Ti C r) 0.497 V0.42 Fe0.083 is a new kind of vanadium Fe content of hydrogen storage alloys with appropriate suction pressure and release hydrogen platform under atmospheric good on hydrogen electrode material directly, but as its electricity catalytic activity, and still discharge capacity is low. In order to enhance the effective discharge capacity, improve the power of catalytic activity with vanadium alloy (Ti C r) 0.497 V0.42 Fe0.083 as the research object, by (Ti C r) 0.497 V0.42 Fe0.083 add good electrical catalytic activity of Ni elements, and the electric smelting La Ni Mg-AB3.5 department alloy of vanadium alloy (Ti C r) 0.497 V0.42 Fe0.083 mechanical alloying ball mill and surface modification, studied the method of alloying and surface modification (Ti C r) 0.497 V0.42 Feo.083 vanadium hydrogen-storage alloy electrode material of catalytic activity, electrical discharge capacity and the influence law of life cycle, analyzed the compound hydrogen storage material electrode electrochemical behavior and to influence factors. The main research results are as follows:First, use different amount of (TiCr) 0.497 V0.42 Feo.083 vanadium hydrogen-storage alloy (TiCr) and alloying elements V melting, smelting of as-cast alloy electrode materials, processing as by XRD, SEM, electrochemical performance testing, the results show that:the vacuum smelting of as-cast electric arc furnace (Ti Cr) 0.497-x Fe0.083 NixV0.42 (x= 0,0.10.20.3) and (Ti Cr) 0.497 Fe0.083 NixV0.42-x (x= 0,0.10.150.2) alloy phase structure of the BCC crystallology FangJing six of them Laves phase composition, C14 electrode material life cycle as well, but when the discharge capacity, low (Ti Cr) 0.497-x Feo.083 NixV0.42 (x= 0,0.10.20.3) 120.0 maximum alloy mAh/g, (Ti Cr) 0.497 Fe0.083 NixV0.42-x (x= 0, Nix 0.10.15 0.2) 115.7 maximum alloy mAh/g, With the increase of x, alloy electrode materials for electrical catalytic activity, discharge capacity, circulation service life, high magnification discharge have different degrees of improvement.Next, add the La-Mg-Ni AB3.5 (TiCr) 0.497 V0.42 Fe0.083 vanadium hydrogen storage alloys for ball mill modification, and the different ball mill time for (TiCr) 0.497 V0.42 Fe0.083 -30wt% La1.5 Mg0.5 Ni6.7 Al0.3 composite electrode materials phase structure and electrochemical properties. Research shows that:the mechanical ball mill for composite materials by AB3.5 phase composition and BCC, ball mill after the new phase, didn't produce samples with the ball mill time, some AB3.5 diffraction peak intensity gradually reduce to disappear, BCC single phase, SEM observation, AB3.5 composite inlay (Ti C r) 0.497 V0.42 Fe0.083 vanadium hydrogen-storage alloy surface milling time and different, enchase degree is different, The electrochemical test showed that with the increase of milling time and modified electrode materials for electrical catalytic activity, discharge capacity, circulation service life, high magnification discharge have different degrees of improvement, ball mill 3h, composite materials (Ti C r) 0.497 V0.42 Fe0.083 -30wt% La1.5 Mg0.5 Ni6.7 Al0.3 has the highest discharge capacity 390.08 mAh/g, and have good stability, the cycle after cycle 100 times for 92%. Keep rate capacity,Finally, at the same time, the ball mill under different quantity to add AB3.5 alloy (Ti Cr) 0.497 V0.42 Feo.083 for ball mill modification, (Ti C r) 0.497 V0.42 Fe0.083-Ⅹwt% La1.5 Mgo.5 N16.7 Al0.3 compound hydrogen storage material, electrochemical properties and structure, the results obtained indicate (Ti C r) 0.497 V0.42 Fe0.083 alloy itself by single BCC phase composition, ball mill by the composite phase composition, AB3.5 phase BCC AB3.5 added with the increased amount of alloy, AB3.5 phase peak gradually reduce disappears, form a single BCC, when adding AB3.5 alloy for 45%, AB3.5 phase peak appeared again, V hydrogen storage alloy with no AB3.5 produces chemical reaction. The electrochemical test indicate (Ti C r) 0.497 V0.42 Feo.083 -xWT% La1.5 Mg0.5 Ni6.7 Al0.3 compound hydrogen storage material as the electrode materials, with the increase of value, the x number of activation, the maximum discharge capacity and reduce increase, When x=30, peak discharge capacity for 390.0 mAh/g, when AB3.5 alloy additives for 45 percent increase, compound hydrogen storage material discharge capacity dropped. Overall, with the increase of x, composite electrode materials for electrical catalytic activity, discharge capacity, circulation service life, high magnification discharge continues to improve, when adding AB3.5 alloy for 45%, discharge capacity, circulation service life, high magnification discharge have different lcvel. |
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